Chuck



NOV. 21, 1933. A, LUNDlN 1,935,644

CHUCK Filed Aug. 8, 1932 FIG. I

V TOR ATTORNEY Patented Nov. 21, "1933 UNITED STATES CHUCK Axel G. Lundin, Brooklyn, N. Y., assignor to American Machine & Foundry Company, a corporation of New Jersey Application August 8, 1932. Serial No. 627,948

1 Claim. (01.219-9) This invention relates to chucks of the type in which a body portion is rotatable with respect to a surrounding element or sleeve and more particularly to an improvement in the retaining means between the chuck body and the sleeve. An example of this general type of chuck is that disclosed in the U. S. patent to Halstead, 1,250,- 864. Inthis type of chuck the chuck is operated by gripping and holding stationary an external sleeve during and without stopping rotation of the body of the chuck. For easy assembly and for the purpose of holdingthe body within the sleeve, the sleeve is provided with a split locking ring projecting within the sleeve and coacting with a projecting surface on the body to prevent displacement of the body. Hithertofore the rubbing action of the lockin ring on the body portion wore the ring and body portion until the body portion, which is one of the most expensive parts of the chuck, wore out. This wear was increased by the fact that the edges of the split portion of the ring after some wear of the ring became very sharp and acted to more rapidly cut or wear the chuck body. Since it is 5 undesirable that there be any projecting lubricating parts and it is diflicult to keep oil here,

since this portion opens downwardly, lubrication has been found inadequate.

Applicant has discovered that a very satisfactory solution of'the above difiiculty results from interposing a washer or thrust ring preferably of a material such as rawhide between the split ring and the body. The rawhide being softer than either the split ring or the body, takes the wear instead of the expensive body part. Moreover, it has been found to wear more slowly than the hardened steel parts formerly used, due it is thought to the slight but effective inherent lubricating qualities of the rawhide and to the difference in hardness of the rawhide relative to the adjoining parts, and because the rawhide prevents the hardened split locking ring from acting as a wearing or cutting agent on the body portion. With this and other objects not specifically mentioned in view, the invention consists in certain constructions and combinations which will be hereinafter fully described and then specifically set forth in the claim hereunto appended.

In the accompanying drawing, which forms a 0 part of this specification and in which like characters of reference indicate the same or like parts, Fig. 1 is a side elevation partly brokenaway of a chuck constructed in accordance with the invention; Fig. 2 is a detail plan view of the thrust washer shown in Fig. 1. I

In carrying the invention into effect there is provided a chuck having a sleeve and a body within the sleeve, one adapted to remain stationary while the other rotates, the sleeve having a locking ring projecting within the sleeve for retaining the body therein, and a washer of material softer than the body or the ring interposed between said body and ring. In the best constructions this washer is preferably of rawhide.

Referring to Fig. 1, the improved chuck includes a body 10 secured within a sleeve 11 for relative rotation with respect to said sleeve, by means of a split locking ring 12 which coacts with an annular projection 13 on the body to retain the body in the sleeve.

Interposed between this split locking ring and the annular projection is the rawhide washer or thrust ring 14, also of split construction for easy assembly.

A spring 15 acts on the upper side of the projection 13. The conical jaws 16 are in engagement with a conical shell 17 secured to. the body.

The jaws are operated through an element 18 which is controlled by the sleeve 11, which for this purpose is gripped and held stationary by the operator while the shank 19 and body of the chuck continues to rotate. The means for operating the jaws from the sleeve are not shown because not a part of the present invention, but these means are of the general type disclosed in the above mentioned patent to Halstead.

It will be seen from the foregoing that any wear that takes place will be confined to the inexpensive and easily replaceable washer 12. Moreover the rawhide washer needs no lubrication, has suflicient resistance to compression and unlike hardened steel elements, is not susceptible to fracture.

I claim:

In a drill chuck, the combination with jaws, a body portion carrying the jaws, and a sleeve surrounding a portion of the body rotatable relative to thesaid body, said sleeve being grooved on the lover end of its inner side, a split locking ring located in said groove, said body having an annular projection'coacting with said ring to retain the body portion in the sleeve, a rawhide ring interposed between said locking ring and the under side of said annular projection and unsecured to said body and sleeve to prevent wear to the split ring onthe body, and a spring having its ends interposed between said sleeve and the upper side of said projection.

AXEL G. LUNDIN. 

